Drop callback of SiTrackMaker_xk (ATLASRECTS-4729)

Susumu Odarequested to merge
oda/athena:master-ATLASRECTS-4729 into master

The callback of SiTrackMaker_xk was dropped.

IMagFieldSvc is fully directly used in SiTrackMaker_xk.

https://its.cern.ch/jira/browse/ATLASRECTS-4729

RunTier0Tests.py was fine. RunTier0Tests.log

Edited by Susumu Oda

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